Patents by Inventor Walter L. Trimmer

Walter L. Trimmer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Low power flow measuring device
    Patent number: 5625569
    Abstract: A low power flow measuring apparatus, including a battery for generating a supply signal, a power management unit for producing from the supply signal a first voltage signal that is always enabled and a second and third voltage signal that are selectively enabled, a sensor powered by the third voltage signal for generating a data signal representative of a magnitude of a predefined parameter, and a controller in communication with memory and the sensor and powered by the second signal, for controlling a reading of the data signal from the sensor and the storage of a data value corresponding to the data signal in memory. Interrupt logic, powered by the first voltage signal, activates the power management unit, upon the occurrence of a predefined event, to enable the second and third voltage signals, thereby enabling the controller to take a reading from the sensor. After a reading is taken and the data value written to memory, the power management unit disables the second and third signals to save power.
    Type: Grant
    Filed: January 23, 1995
    Date of Patent: April 29, 1997
    Assignee: Trimmer Engineering, Inc.
    Inventors: Walter L. Trimmer, Benjamin A. Flugstad